Preparation and Evaluation of Nano-Hydroxyapatite/β-Tricalcium Phosphate/Chitosan Composite Scaffolds for Bone Tissue Engineering

2007 ◽  
Vol 361-363 ◽  
pp. 463-466
Author(s):  
T. Lin ◽  
S.M. Zhang ◽  
J. Li ◽  
L. Zhang ◽  
Y.H. Liu ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
Composite Scaffolds ◽  
X Ray ◽  
Viable Cells ◽  
Physical And Chemical ◽  
Chitosan Composite ◽  
Preparation And Evaluation ◽  
And Chemical Properties

The composite scaffolds with nine different ratios of nano-HA and ß-TCP content were fabricated by using lyophilization method. Their microscopy, physical and chemical properties were investigated by using scanning electron microscopy (SEM), X-ray diffraction (XRD), and fourier transformed infrared (FTIR) spectroscopy. MTT test was applied to quantitatively assess the number of viable cells attached and grown on the scaffolds. And the result showed that the amount of cells on the scaffold containing 30% by mass of nano-HA was significantly higher than the other samples.

Monitoring of Fluctuations in the Physical and Chemical Properties of a High-Calcium Fly Ash

1987 ◽  
Vol 113 ◽  
Author(s):  
Scott Schlorholtz ◽  
Ken Bergeson ◽  
Turgut Demirel
Keyword(s):  
Fly Ash ◽  
Chemical Properties ◽  
Operating Conditions ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Morphological Studies ◽  
High Calcium ◽  
Physical And Chemical ◽  
And Chemical Properties

ABSTRACTThe physical and chemical properties of fly ash produced at Ottumwa Generating Station have been monitored since April, 1985. The fly ash is produced from burning a low sulfur, sub-bituminous coal obtained from the Powder River Basin near Gillette, Wyoming. One-hundred and sixty samples of fly ash were obtained during the two year period. All of the samples were subjected to physical testing as specified by ASTM C 311. About one-hundred of the samples were also subjected to a series of tests designed to monitor the self-cementing properties of the fly ash. Many of the fly ash samples were subjected to x-ray diffraction and fluorescence analysis to define the mineralogical and chemical composition of the bulk fly ash as a function of sampling date. Hydration products in selected hardened fly ash pastes, were studied by x-ray diffraction and scanning electron microscopy. The studies indicated that power plant operating conditions influenced the compressive strength of the fly ash paste specimens. Mineralogical and morphological studies of the fly ash pastes indicated that stratlingite formation occurred in the highstrength specimens, while ettringite was the major hydration product evident in the low-strength specimens.

scholarly journals Effects of Structural Symmetry on NMR Spectra of 3,9-Diazatetraasteranes

2021 ◽  
Author(s):  
Runzhi Sun ◽  
Xiuqing Song ◽  
Fan Xie ◽  
Huiqin Wang ◽  
Hong Yan
Keyword(s):  
Nmr Spectra ◽  
Chemical Properties ◽  
2D Nmr ◽  
The Self ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
Structural Symmetry ◽  
X Ray ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract The structural symmetry is of great significance on the unique physical and chemical properties that closely related to pharmacological applications. To investigate the effects of structural symmetry on the NMR spectra, C2-3,9-diazatetraasteranes and non-C2-3,9-diazatetraasteranes were selected as the research object. They were synthesized by the self-dimerization and cross-dimerization of diethyl 1,4-dihydropyridine-3,5-dicarboxylates, respectively. The differences and similarities in NMR spectra of these two types of 3,9-diazatetraasteranes were discussed by the 1D-NMR and 2D-NMR analysis. The single-crystal X-ray diffraction (XRD) was used to demonstrate directly their structural symmetry.

The Thermal Decomposition Characteristics of Sodium Pyroxenite Gangue in Baiyunebo Iron Ore

2014 ◽  
Vol 887-888 ◽  
pp. 939-946
Author(s):  
Guo Ping Luo ◽  
Sheng Li Wu ◽  
Xiao Long Nie ◽  
Yi Ci Wang ◽  
Yue Cong Wang
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Iron Ore ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wide Range ◽  
Physical And Chemical ◽  
And Chemical Properties

The changes of physical and chemical properties of sodium pyroxenite gangue such as decomposition and phase transformation were researched by means of differential thermal analysis and X-ray diffraction. The results show that the natural sodium pyroxenite gangue contains the main mineral of aegirite(NaFe+3Si2O6), and it contains a number of BaSO4 and Na3Ca2(SO4)3F, etc. The water of crystallization decomposes at 554.7°C. The Na3Ca2(SO4)3F decomposes into the composite sulfate and CaF2 over a wide range of temperatures. The main mineral of aegirite(NaFe+3Si2O6) reacts with CaF2 into NaF gas at 993.4°C. The sodium pyroxenite gangue is melts and releases a small amount of SiF4 gas in the range of 1193.5-1300.7°C.

Physical and Chemical State of the Concrete Piers of the Former Franz Joseph Bridge Built in 1891

2016 ◽  
Vol 691 ◽  
pp. 297-308
Author(s):  
Ivan Janotka ◽  
Peter Paulík ◽  
Patrik Ševčík ◽  
Michal Bačuvčík
Keyword(s):  
Mercury Intrusion Porosimetry ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mercury Intrusion ◽  
Elasticity Module ◽  
European Standards ◽  
Physical And Chemical ◽  
And Chemical Properties

This article discusses the properties of concrete within the piers of the Old Bridge in Bratislava (former Franz Joseph Bridge). It was the first permanent bridge across the river Danube in Bratislava as well as within the present territory of Slovakia. Mechanical, physical and chemical properties were verified on core drills, some of them being almost 23 m long. The concretes were tested for dynamic and Young’s elasticity module and compressive strengths. Subsequently the fines of concrete specimens were studied by the X-ray diffraction, TG-DTA and mercury intrusion porosimetry techniques and also by chemical analyses and SEM observations. The piers were made from 5 different concrete kinds. The concrete in the caissons and in the piers does not fulfil the criteria for structural concrete defined in the present European standards. This finding seriously suggests that carrying capacity of the piers after the reconstruction of the bridge, without any strengthening would become questionable.

scholarly journals Liquid Phase Nitration of Benzene Catalyzed by a Novel Salt of Molybdovanadophosphoric Heteropolyacid

2021 ◽  
Author(s):  
Jianan Liu ◽  
Yanan Wang ◽  
Shuwen Gong ◽  
Wenzeng Duan ◽  
Xianqiang Huang
Keyword(s):  
Chemical Properties ◽  
Reaction Medium ◽  
Catalytic Performance ◽  
Reusable Catalyst ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Physical And Chemical ◽  
And Chemical Properties

A highly efficient and reusable catalyst QA-HPMV was successfully prepared by the reaction of quinoline-2-formic acid (QA) with molybdovanadophosphoric heteropolyacid (H4PMo11VO40, HPMV) for the nitration of benzene. The physical and chemical properties of the sample was characterized by X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), UV-Vis and thermogravimetric analysis (TG). The characterization results showed that the formed QA-HPMV retained the Keggin structure of HPMV. As a catalyst for benzene nitration, QA-HPMV showed good catalytic performance and the yield of nitrobenzene was 82.5% under the optimized reaction conditions. As a heterogeneous catalyst, QA-HPMV can be easily recycled from the reaction medium by filtering and remained highly catalytic performance even after five runs of recycling.

Study on Thermal Physical and Chemical Properties of Sodium Pyroxenite in Baiyunebo Iron Ore

2011 ◽  
Vol 194-196 ◽  
pp. 185-189
Author(s):  
Yue Cong Wang ◽  
Yi Ci Wang ◽  
Guo Ping Luo ◽  
Guang Jie Zhang ◽  
Qian Bing Lu
Keyword(s):  
Iron Ore ◽  
Chemical Properties ◽  
Calcium Ferrite ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
Complex Calcium ◽  
X Ray ◽  
Melting Temperatures ◽  
Physical And Chemical ◽  
And Chemical Properties

A typical kind of silicate gangue — sodium pyroxenite (mainly containing NaFeSi2O6) in Baiyunebo iron ore is selected as the research object in this paper. The endothermic peak and the change of quality is definited by means of thermal analysis (DSC and TG) in the rising process. And then the samples are sintered at the peak temperatures. The main ingredients of sodium pyroxenite and the resultants are definited by means of X-ray diffraction analysis (XRD). The experiment ascertains the change law of physical and chemical properties of sodium pyroxenite such as thermal decomposition, softening, melting temperatures and the corresponding resultants, which provides basic data for exploring the formation mechanism of complex calcium ferrite (SFCA) in baogang special sintered ore.

scholarly journals Corrosion Behavior of VM12-SHC Steel in Contact with Solar Salt and Ternary Molten Salt in Accelerated Fluid Conditions

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5903
Author(s):  
Gustavo García-Martín ◽  
María I. Lasanta ◽  
María T. de Miguel ◽  
Andre Illana Sánchez ◽  
Francisco J. Pérez-Trujillo
Keyword(s):  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Storage Medium ◽  
X Ray Diffraction ◽  
Solar Salt ◽  
X Ray ◽  
Direct System ◽  
Physical And Chemical ◽  
Scanning Electron ◽  
And Chemical Properties

Ternary low melting point mixtures with the addition of LiNO3 and Ca(NO3)2 have been presented as direct system candidates for CSP technologies due to having better physical and chemical properties than those of Solar Salt. In this study, thermal, physical and chemical properties are measured as is the corrosive behavior of stainless alloy VM12 (Cr 12%) when in contact with Solar Salt, 60% NaNO3-40% KNO3 (wt.%) and ternary 46% NaNO3-19% Ca(NO3)2-35% LiNO3 (wt.%). Gravimetric weight change measurements were performed on the test specimens, which were tested under accelerated fluid conditions (0.2 m s−1) at 500 °C for 2000 h. This research confirms the potential of this novel formulation as a thermal storage medium and validates the suitability of ferritic VM12-SHC stainless steel as a structural material for CSP technology with Solar Salt. Meanwhile, the results obtained by scanning electron microscopy and X-ray diffraction indicate a reduction in the protective character of the oxide layer formed on this alloy when the medium contains calcium and lithium components.

Characterization and Analyzation of Chitosan from Anadara granosa Shell

2016 ◽  
Vol 675-676 ◽  
pp. 463-466 ◽  
Author(s):  
Kanyakorn Teanchai ◽  
Nirun Witit-Anun ◽  
Surasing Chaikhun
Keyword(s):  
Crystalline Structure ◽  
Research Work ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Physical And Chemical ◽  
Anadara Granosa ◽  
And Chemical Properties ◽  
Chitosan Powder

This research work aims at characterize and analysis the physical and chemical properties of chitosan which derived from the Anadara granosa Shell. The physical and chemical properties have been also discussed in detail with X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR) Spectroscopy and Energy Dispersive X-Ray Fluorescence (EDXRF). The result showed that the XRD pattern indicated the Anadara granosa shell have crystalline structure of CaCO3 in Aragonite phase, while chitosan powder which extract from Anadara granosa shell has amorphous-crystalline structure. Another that, FTIR results confirmed the deeply formation of intermolecular bonding between the functional groups of the sample which the spectrum of FTIR indicate that the characteristic feature of Aragonite phase with the band of FTIR at ~1083 while the band at ~1653 were agree with chitosan polysaccharide. In addition, the EDXRF result were indicated that the concentrations of organic compounds in chitosan which extract from Anadara granosa shell have concentration is 33.581Wt% while the Anadara granosa shell have 0.033 Wt%. For Calcium (Ca) element the chitosan powder have concentration is 66.157 Wt% while the Anadara granosa shell have 99.850 Wt%.

Sign in / Sign up

Export Citation Format

Share Document